Vernonia missurica |
Vernonia baldwinii |
|
---|---|---|
Missouri ironweed |
Baldwin's ironweed |
|
Habit | Plants 6–12(–20+) dm. | Plants 6–10(–15) dm. |
Stems | puberulent. |
puberulent to ± tomentose. |
Leaves | mostly cauline; blades elliptic to lance-ovate or lanceolate, 6–16(–20+) cm × 18–48+ mm, l/w = 2.5–4(–6+), abaxially usually puberulent to tomentose or pannose (hairs ± erect, ± curled), seldom glabrate, resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
mostly cauline; blades elliptic to lance-ovate or lanceolate, 8–15(–18+) cm × 20–45(–75+) mm, l/w = 2–5, abaxially usually puberulent to tomentose or pannose (hairs ± erect, ± curled), seldom glabrate, resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
Peduncles | 3–35 mm. |
1–25 mm. |
Involucres | broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm. |
broadly campanulate to hemispheric, 4–6(–8+) × 4–7+ mm. |
Florets | 30–55+. |
(15–)20–25(–35+). |
Phyllaries | 50–70+ in 6–7 series, sparsely scabrellous, glabrescent (seldom resin-gland-dotted), margins ciliolate, the outer lanceolate, 1–2 mm, inner linear-oblong to oblong, 6–7(–9+) mm, tips acute or rounded-apiculate. |
45–65+ in 5–6 series, usually puberulent (often resin-gland-dotted distally), sometimes glabrescent, margins ciliolate, the outer lance-ovate, 1–2 mm, inner oblong to lanceolate, 5–8+ mm, tips rounded-apiculate to acute (sometimes recurved). |
Heads | in corymbiform-scorpioid arrays. |
in corymbiform-scorpioid arrays. |
Cypselae | 3.5–4; pappi stramineous to whitish, outer scales 25–30, 0.5–1.1 mm, contrasting with 35–40+, 6–8+ mm inner bristles. |
2.5–3 mm; pappi fuscous to purplish, outer scales 25–30, 0.2–1 mm, contrasting with 35–40+, 5–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia missurica |
Vernonia baldwinii |
|
Phenology | Flowering Jul–Sep. | Flowering Jun–Nov. |
Habitat | Prairies, loamy to sandy soils | Disturbed places, grasslands, flood plains, forest margins, prairies |
Elevation | 30–200 m (100–700 ft) | 10–1100 m (0–3600 ft) |
Distribution |
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
|
AR; CO; IA; IL; KS; KY; LA; MI; MO; NE; OK; TX
|
Discussion | Regarding Vernona baldwinii and V. interior, L. H. Shinners (1950) wrote, “The tips of the phyllaries vary from loosely appressed to squarrose, and from puberulent to almost completely glabrous on the inner face. The geographic distribution of the two extremes is nearly identical. I consider the two to be merely forms of one species.” I concur. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 19, p. 212. | FNA vol. 19, p. 213. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. baldwinii subsp. interior, V. baldwinii var. interior, V. interior | |
Name authority | Rafinesque: Herb. Raf., 28. (1833) | Torrey: Ann. Lyceum Nat. Hist. New York 2: 211. (1827) |
Web links |